On Île Tintamarre (Saint-Martin, French Antilles)

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On Île Tintamarre (Saint-Martin, French Antilles) Discovery of a population of Spondylurus powelli (Squamata: Mabuyidae) on Île Tintamarre (Saint-Martin, French Antilles) and comments on relationships among skinks of the Anguilla Bank Olivier Lorvelec, Nicolas Barré, Julien Chalifour, Benoit Pisanu, Alexandre Teynié, S. Blair Hedges To cite this version: Olivier Lorvelec, Nicolas Barré, Julien Chalifour, Benoit Pisanu, Alexandre Teynié, et al.. Discovery of a population of Spondylurus powelli (Squamata: Mabuyidae) on Île Tintamarre (Saint-Martin, French Antilles) and comments on relationships among skinks of the Anguilla Bank. Caribbean Herpetology, Caribbean Herpetology, 2017, 59, pp.1-8. hal-01581632 HAL Id: hal-01581632 https://hal.archives-ouvertes.fr/hal-01581632 Submitted on 4 Sep 2017 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Distributed under a Creative Commons Attribution - ShareAlike| 4.0 International License caribbean herpetology article Discovery of a population of Spondylurus powelli (Squamata: Mabuyidae) on Île Tintamarre (Saint-Martin, French Antilles) and comments on relation- ships among skinks of the Anguilla Bank Olivier Lorvelec1, 2,*, Nicolas Barré2 , Julien Chalifour3, Alexandre Teynié4, Benoît Pisanu5, and S. Blair Hedges6 1ESE (Écologie et Santé des Écosystèmes), INRA, Agrocampus Ouest, 65 Rue de Saint-Brieuc, 35042 Rennes, France. 2AEVA (Association pour l’Etude et la protection des Vertébrés et végétaux des petites Antilles), 97170 Petit-Bourg, Guadeloupe, France. 3Association de Gestion de la RNNSM (Réserve Naturelle Nationale de Saint-Martin), Résidence les Acacias, Anse Marcel, 97150 Saint-Martin, France. 4EPIA (Epidémiologie des Maladies Animales et Zoonotiques), INRA, VetAgro Sup, 63122 Saint-Genès-Champanelle, France. 5 UMS 2006 Patrimoine Naturel, MNHN, AFB, CNRS, Maison Buffon, CP 41, 36 Rue Geoffroy Saint-Hilaire, 75231 Paris Cedex 05, France. 6Center for Biodiversity, Temple University (502 SERC), 1925 N. 12th Street, Philadelphia, PA 19122, USA. *Corresponding author ([email protected]) Edited by: Robert Powell. Date of publication: 6 July 2017. Citation: Lorvelec O, Barré N, Chalifour J, Teynié A, Pisanu B, Hedges SB. 2017. Discovery of a population of Spondylurus powelli (Squamata: Mabuyidae) on Île Tintamarre (Saint-Martin, French Antilles) and comments on relationships among skinks of the Anguilla Bank. Caribbean Herpetology, 59, 1–8. Abstract In March 2013, we discovered a population of skinks on Île Tintamarre located northeast of Saint-Martin. All individuals observed in 2013 and 2014 were found in a network of dry stone walls. Genetic and morphological analyses unambig- uously show that this population belongs to Spondylurus powelli, which also lives on Anguilla and Saint-Barthélemy, and not to S. martinae, the species of adjacent Saint-Martin. This unexpected pattern of distribution is similar to that of at least one other species of squamate reptile and further supports the distinction of these two recently described species of skinks. The population size is estimated at only 40–50 adult individuals. Threats are specified and we recom- mend necessary measures for the conservation of this population. Keywords: Caribbean, island, lizard, Spondylurus, systematics, biogeography, threats, conservation. In March 2013, we discovered a population of skinks on Île Tintamarre. This islet belongs to the Anguilla Bank in the northern Lesser Antilles. This group of islands, separated by a relatively shallow seabed, was a single island during marine regressions linked to Quaternary glaciations. The Anguilla Bank (Fig. 1) comprises three main islands of Anguilla, Saint-Martin, and Saint-Barthélemy. The principal islets of Anguilla are Scrub Island, the Prickly Pear Cays, and Dog Island. Those of Saint-Martin (hereafter St. Martin) are Île Tintamarre (hereafter Tintamarre) and Îlet Pinel (hereafter Pinel). Those of Saint-Barthélemy (hereafter St. Barts) are La Tortue, Île Frégate, Île Chevreau, and Île Fourchue. Tintamarre (1.20 km², Fig. 2) is an uninhabited island located less than 3 km northeast of St. Martin (87 km²). The maximum elevation of Tintamarre is about 30 m in the north and northeast. Its west/east length and its north/south width, intersecting in the center of the island (18.11873, -62.98092), are 1.60 km and 0.67 km, respec- tively. This island is particularly dry due to low precipitation and its porous limestone soil. Other than a lagoon and dune areas, the vegetation is dominated by a dry forest, thickets, and, on the eastern side, an aerohaline lawn. All of the vegetation is affected by grazing feral goats. Human activity is now limited in the interior of the island but tourism is relatively important on the beach and adjacent southwestern areas of the island. Tintamarre is part of the “Collectivité de Saint-Martin” (53 km²), a French overseas collectivity located on the northern side of St. Mar- 1 Caribbean Herpetology 59:1–8 ISSN 2333-2468 www.caribbeanherpetology.org caribbean herpetology article tin. Sint Maarten (34 km²), an autonomous Dutch state, is located on the southern side of St. Martin. The whole of Tintamarre is classified as a natural area of ecological, faunal, and floristic interest (ZNIEFF Type I according to French legislation). The central portion of the island (0.73 km², 61 % of the total) belongs to a private owner. Only the coastal zone (0.47 km², 39 % of the total) belongs to the ‘‘Conservatoire du Littoral’’ (hereafter CL) and is part of the territory of the ‘‘Réserve Naturelle Nationale de Saint-Martin’’ (hereafter RNNSM). Hedges & Conn (2012) assigned seventeen species of skinks to the genus Spondylurus, including ten new species described in their work. The distribu- tion of the genus ranges from the Turks and Caicos Islands (southeast of the Bahamas) through Jamaica, Hispaniola, and the Puerto Rican region (including Mona, Monito, the U.S. and British Virgin Islands) to the Anguilla Bank in the Lesser Antilles. The only skinks of the Anguilla Bank, S. martinae and S. powelli, were both newly described by Hedges & Conn (2012). Spondy- lurus martinae, the St. Martin Skink, was described on the basis of two MCZ (Museum of Comparative Zoolo- Figure 1. Distribution of skinks of the Anguilla Bank based on Hedges gy, Cambridge) specimens collected on an unknown & Conn (2012) and this paper. date but no later than 1966 and seven ANSP (Academy of Natural Sciences, Philadelphia) specimens probably collected between 1863 and 1877, all from the main island of St. Martin. In the case of the MCZ specimens, the original museum ledger indicates that they were collected by “G. A. Scamon” and donated to MCZ by Wagenaar Hummelinck, a Dutch marine biologist who was active in the middle of the 20th Century. A search of the MCZ database for his other donations of material collected on St. Martin indicates actual collection dates in 1963. From this, we surmise that the two skinks from Little Bay were probably collected at approximately the same time (~1963), shortly before being accessioned in 1966. Spondylurus powelli, the Anguilla Bank Skink, was described on the basis of ten specimens collected from 1963 to 2000 on Anguilla and six specimens collected in 1997, 2003, and at unknown dates on St. Barts. In the same work, the authors defined the martinae group, a species group including only these two species. The aim of this paper is to specify habitat and size of the population on Tintamarre, and identify the spe- cies to which this population belongs. We also discuss how the discovery of a population of skinks on Tintamarre pertains to the biogeography of skinks of the Anguilla Bank. Finally, we provide some recommendations for con- servation of the Tintamarre population. Materials and Methods The search for skinks required walking slowly and silently along paths, in the undergrowth, in open areas, or near small dry stone walls, while observing a few meters to the sides and ahead, or using binoculars. We focused at- tention on small and dry stone walls in good condition. We progressed along the sides of walls, or on the tops of walls (1.5 m high and width) when vegetation prevented us from passing on the side. Our visits were generally in the morning between 0730 and 1130 h in good weather conditions. Our movement was generally slower than one kilometer an hour. Wherever possible, each observation of a skink was associated with a GPS point, the date and time, the weather conditions, the sun exposure, the nature of the substrate on which the animal was found, the description of its habitat, and the possible presence of predators. Photographs were taken as often as possible. Three individuals of the Tintamarre skink population were sampled genetically. Sequences of three mitochondrial genes (12S rRNA, 16S rRNA, and cytochrome b) were obtained, following the methods detailed in Hedges & Conn 2 Caribbean Herpetology 59:1–8 ISSN 2333-2468 www.caribbeanherpetology.org caribbean herpetology article (2012), and deposited in GenBank (KY905146–KY905154). The morphological methods followed Hedges & Conn (2012). Results Discovery of the population and its habitat. A survey of mammals introduced on the islands belonging to the RNNSM was carried out in March 2013 by the “Institut National de la Recherche Agronomique” (thereafter INRA) and the “Association de Gestion de la RNNSM”. Tintamarre, Pinel, Caye Verte, and Rocher Créole were also inves- tigated in order to seek potential skinks. No skink was observed on Pinel (four visits), Caye Verte (four visits), or Rocher Créole (one visit), the latter comprising a pair of tiny islands that do not provide a favorable habitat for skinks.
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